docs: def dP_cone_meter(D, Dc, P1, P2):
      r'''Calculates the non-recoverable pressure drop of a cone meter
      based on the measured pressures before and at the cone end, and the 
      geometry of the cone meter according to [1]_.
      
      .. math::
          \Delta \bar \omega = (1.09 - 0.813\beta)\Delta P
          
      Parameters
      ----------
      D : float
          Upstream internal pipe diameter, [m]
      Dc : float
          Diameter of the largest end of the cone meter, [m]
      P1 : float
          Static pressure of fluid upstream of cone meter at the cross-section of
          the pressure tap, [Pa]
      P2 : float
          Static pressure of fluid at the end of the center of the cone pressure 
          tap, [Pa]
  
      Returns
      -------
      dP : float
          Non-recoverable pressure drop of the orifice plate, [Pa]
  
      Notes
      -----
      The recoverable pressure drop should be recovered by 6 pipe diameters 
      downstream of the cone meter.
      
      Examples
      --------
      >>> dP_cone_meter(1, .7, 1E6, 9.5E5)
      25470.093437973323
      
      References
      ----------
      .. [1] ISO 5167-5:2016 - Measurement of Fluid Flow by Means of Pressure 
         Differential Devices Inserted in Circular Cross-Section Conduits Running
         Full -- Part 5: Cone meters.
      '''
      dP = P1 - P2
      beta = diameter_ratio_cone_meter(D, Dc)
      return (1.09 - 0.813*beta)*dP